Method for producing recycled material, and tire and method for producing tire

Abstract

There is provided a method for producing a recycled material, whereby a recycled material can be efficiently obtained from a tire. The method for producing a recycled material according to the present invention includes a step of subjecting a tire to a gasification treatment to generate a gas containing a C1 gas from the tire, and a step of obtaining a recycled material containing at least one species selected from the group consisting of isoprene, butadiene, a butanediol compound, a butanol compound, a butenal compound, succinic acid, and polymers of these compounds by using the gas containing the C1 gas.

The invention claimed is: 
     
       1. A method for producing a tire, the method comprising:
 a step of subjecting a tire to a gasification treatment to generate a gas comprising a C1 gas from the tire, the C1 gas comprising carbon monoxide gas, the gas comprising the C1 gas containing 69 mol % of CO x , said x in the CO x  gas being 1≤x≤2, a H 2 /CO x  ratio by mol % in the gas comprising the C1 gas being less than 1, 
 a step of directly converting the C1 gas comprising carbon monoxide gas to at least one species selected from the group consisting of isoprene, butadiene, and polymers of these compounds by using a microbial catalyst without obtaining an intermediate substance between the C1 gas and the at least one species to obtain a recycled tire material comprising the at least one species selected from the group consisting of isoprene, butadiene, and polymers of these compounds, and 
 a step of obtaining a tire by using the recycled tire material. 
 
     
     
       2. The method for producing a tire according to  claim 1 , wherein the tire to be used for the gasification treatment is a waste tire. 
     
     
       3. The method for producing a tire according to  claim 1 , wherein the gas comprising the C1 gas further comprises hydrogen gas. 
     
     
       4. The method for producing a tire according to  claim 2 , wherein the gas comprising the C1 gas further comprises hydrogen gas. 
     
     
       5. The method for producing a tire according to  claim 1 , wherein the microbial catalyst is a  Clostridium  microorganism. 
     
     
       6. The method for producing a tire according to  claim 2 , wherein a microorganism of the microbial catalyst is a  Clostridium  microorganism. 
     
     
       7. The method for producing a tire according to  claim 3 , wherein a microorganism of the microbial catalyst is a  Clostridium  microorganism. 
     
     
       8. The method for producing a tire according to  claim 4 , wherein a microorganism of the microbial catalyst is a  Clostridium  microorganism. 
     
     
       9. The method for producing a tire according to  claim 8 , wherein
 at least 80% by mass of the gas comprising the C1 gas and the hydrogen gas is the C1 gas and the hydrogen gas; 
 said gasification treatment comprises heating said tire to 1300° C. to separate said tire into said C1 gas, carbonization carbon, and metallic components; 
 the microbial catalyst is prepared by introducing a nucleic acid capable of coding 1,4-butanediol synthase into the  Clostridium  microorganism in the presence of the C1 gas; and 
 in the step of obtaining a tire by using the recycled tire material, a tire constituent material other than the recycled tire material is used in addition to the recycled tire material, said tire constituent material comprising a carbonaceous pigment.